Well obviously based on my handle I voted for MMM, which are at their hottest when I'm the designated bottom. Love that, and have done it several times.
Though believe it or not I also did a MFM threesome in college, during a brief phase where I experimented with vagina (lol). That was also very hot, though it was abundantly clear that I was way more into the guy than the girl. She kept egging him on (he was her boyfriend at the time) about how bad I probably wanted to suck his cock, yadda yadda. He kept teasing me with it, stroking it and slapping it around asking me if I liked his big dick, if I wanted to taste him, if I wanted up my ass, etc. Typing this now I realize it was pretty goddamned ridiculous, but whatever, at the time I was INTO it. He finally told me to open my mouth and he smacked the head against my lips. And that's when I opened wider, snaked my tongue around the underside of his cock and took the whole thing in my mouth, right down to the balls. I'm not a great deep-throater so not sure how I managed that at the time, but whatever. He just about lost it with surprise, and she came instantly, really hard. That just got him turned on even more and she told him it was the hottest thing she'd ever seen. I kept sucking him like it was my last meal, she was going NUTS fingering herself, and he kept telling me that if I didn't stop he was going to cum in my mouth. Which only made me suck him more aggressively. I swear, when he unloaded in my throat I think it was half a pint.
